Navior's Serpent's Skull

Part 1: Souls for Smuggler's Shiv
Part 2: Racing to Ruin (starts here)
Part 3: City of Seven Spears (still to come)
Part 4: Vaults of Madness (still to come)
Part 5: The Thousand Fangs Below (still to come)
Part 6: Sanctum of the Serpent God (still to come)